Abstract
The temperature dependence of the Ce 4f state of a Kondo semiconductor CeRhAs has been examined by means of high-resolution temperature-dependent photoemission spectroscopy. The Ce 4f spectral intensity near the Fermi level ( E F) is gradually decreased on cooling indicating temperature-dependent metal-to-insulator transition. The magnitudes of the energy-gap for the f, d, and p states are the same, indicating that these states are strongly hybridized near E F and form the energy-gap.
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